Genesis of Ions by the Motion of Positive Ions. TAL 
Air, Pressure 6 mms. 
Oe As 2: | 1 a | 3 | 4 5 
nm alt eh. NS | hae Ee, Pa 
PE 1000 ¢ ............ | 347 | 121° | 425 |) 163 | 880 || 
2 ee eee i Sd (aS iy 
‘a= 1242 n | 347 | 121 | 428 | 163 | 872 | 
f = 0108 Gucccscoeser ‘ a : : | 
a= 572, axX=601, V=604. 
Air, Pressure 8 mms. 
[ae eel 2. 3 4 
Be IM gy ed... 52 275 158 1840 | 
H | 
alii. ba ie ea ae. Wraeehu’ 
LL eee | 52 276 | | 158 | 1a50 | 
a= "tal, @¢%—=603, V=603: 
Air, Pressure 8 mms. 
| | 
| nee ho ee a ee i 
ee |e 
|R=1050 gees esss.. 6-42 42-1. | 380}. 1400. | 
a=9'3 f - | 3 | 
oo ee 6-42 42:5 saa” |" eg? © 
&—(60, “axX=803, V=808. 
In the previous experiments the hydrogen which was used 
was prepared by the electrolysis of potassium hydrate. The 
gas was carefully prepared and the air did not come into 
contact with the potassium-hydrate solution except while the 
solution was being prepared, so that any impurity which 
might have been introduced must have been extremely small. 
Some objections have, however, been raised to the use of 
potassium hydrate, since the carbonates which would be 
formed by contact with air are soluble and the hydrogen 
which is evolved by electrolysis may contain hydrocarbons. 
In order to obtain the gas as pure as possible, the hydrogen 
was prepared by the electrolysis of barium hydrate, which 
forms an insoluble carbonate. According to Mr. H. B. Baker, 
this is the best method of obtaining pure hydrogen, and we 
